diff --git a/.changeset/strange-carrots-fix.md b/.changeset/strange-carrots-fix.md
new file mode 100644
index 0000000000..41ca0b9bd9
--- /dev/null
+++ b/.changeset/strange-carrots-fix.md
@@ -0,0 +1,25 @@
+---
+'@backstage/create-app': patch
+---
+
+Updated the default `App` test to work better on Windows.
+
+To apply this change to an existing app, replace the `process.env.APP_CONFIG` definition in `packages/app/src/App.test.tsx` with the following:
+
+```ts
+process.env = {
+  NODE_ENV: 'test',
+  APP_CONFIG: [
+    {
+      data: {
+        app: { title: 'Test' },
+        backend: { baseUrl: 'http://localhost:7000' },
+        techdocs: {
+          storageUrl: 'http://localhost:7000/api/techdocs/static/docs',
+        },
+      },
+      context: 'test',
+    },
+  ] as any,
+};
+```
diff --git a/packages/app/src/App.test.tsx b/packages/app/src/App.test.tsx
index cf70a7be27..cdb1e8db4a 100644
--- a/packages/app/src/App.test.tsx
+++ b/packages/app/src/App.test.tsx
@@ -20,9 +20,9 @@ import App from './App';
 
 describe('App', () => {
   it('should render', async () => {
-    Object.defineProperty(process.env, 'APP_CONFIG', {
-      configurable: true,
-      value: [
+    process.env = {
+      NODE_ENV: 'test',
+      APP_CONFIG: [
         {
           data: {
             app: {
@@ -39,8 +39,8 @@ describe('App', () => {
           },
           context: 'test',
         },
-      ],
-    });
+      ] as any,
+    };
 
     const rendered = await renderWithEffects(<App />);
     expect(rendered.baseElement).toBeInTheDocument();
diff --git a/packages/create-app/templates/default-app/packages/app/src/App.test.tsx b/packages/create-app/templates/default-app/packages/app/src/App.test.tsx
index 21a2eaa703..82bc479858 100644
--- a/packages/create-app/templates/default-app/packages/app/src/App.test.tsx
+++ b/packages/create-app/templates/default-app/packages/app/src/App.test.tsx
@@ -4,9 +4,9 @@ import App from './App';
 
 describe('App', () => {
   it('should render', async () => {
-    Object.defineProperty(process.env, 'APP_CONFIG', {
-      configurable: true,
-      value: [
+    process.env = {
+      NODE_ENV: 'test',
+      APP_CONFIG: [
         {
           data: {
             app: { title: 'Test' },
@@ -17,8 +17,8 @@ describe('App', () => {
           },
           context: 'test',
         },
-      ],
-    });
+      ] as any,
+    };
 
     const rendered = await renderWithEffects(<App />);
     expect(rendered.baseElement).toBeInTheDocument();